458 



INDEX. 



PAGE 



Weston normal cell xli 



Weston portable ceil xliii 



Wiedemann magnetic effect 36s 



Wind pressures iSo-iS3 



Wire gases, comparison 333 



Wire, mechanical properties: copper 82-83 



steel 78 



steel rope and cable . Ti. 



Wire resistance, auxiliary table for computing . . . 322 



Wire tables: aluminum, English measures .... 34^ 



metric measures .... 343 



see also 334 



copper, English measures 336 



metric measures .339 



see also 334 



temperature coefficients .334,33s 

 reduc. to std. . .333 



Wires, alternating-current resistance 344 



carrying capacity of 329 



high-frequency resistance 344 



Wires, heat losses from incandescent, bright Pt. . 255 



Pt sponge . 253 

 Wireless telegraphy: antenna? resistances .... 364 

 wave-lengths, frequencies, oscil- 

 lation constants 362 



Wolf sun-spot numbers, 1750 to 1917 415 



Woods: densities 96-99, 112 



mechanical properties: conifers, Eng. units. 99 



metric units 97 



hard wds, Eng. units 98 



metric units 96 



Work, conversion factors tttt>f<<.f.i97 



PAGE 



X-rays: 383-393 



absorption coefficients (mass) . . . . . 389 

 atomic numbers and spectra .... 390-393 



calcite grating space 408 



cathode efficiencies 387 



characteristic radiations 387 



corpuscular radiation 387-388 



crystals, diffraction v?ith 401 



energy relations 387 



general radiations 387 



heterogeneous radiations 387 



homogeneous radiations 387 



independent radiations 387 



intensity 38S 



ionization 388 



K series of radiations . . . 390 



L series of radiations 391 



M series of radiations 392 



monochromatic radiations 387 



secondary radiations 387 



spectra: absorption 393 



K series 390 



L series 391 



M series 392 



tungsten 392 



wave-lengths 390-393 



wave-lengths and cathode fall 387 ; 



Years 414,437. 



Yearly temperature means 420 



Young's modulus, definition 74 



values 74—103 



Yield point (mechanical property) 74—103 



Zero, absolute, thermodynamic scale 193 



Zonaj harmonics 64 



